| 简介 |
PROBLEM TO BE SOLVED : To provide a magnet body, excellent in corrosion resistance and dimensional accuracy while having no risk of contamination caused by tin.
SOLUTION : An annular back yoke 1 is provided integrally with the outer periphery of the annular bond magnet 2 consisting of rare earth iron alloy magnetic powder and synthetic resin binder while the surface of the bond magnet 2, which is not in contact with the back yoke 1, is covered by the injection molding layer 3 of a thermoplastic resin which does not contain tin. Resin pools 11, 21 are formed at the boundary between the back yoke 1 and the end surfaces 1a, 1b, 2a, 2b of the bond magnet 2 while the end rims 31 of the injection molding layer 3 invade into the resin pools 11 and are bent so as to hold the bond magnet 2 along the peripheral surfaces of the bond magnet 2.
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